Geochemistry of multiple diamond inclusions of harzhurgitic garnets as examined in situ

Komsomolskaya high-Cr, harzburgitic-garnet, multiple diamond inclusions exhibit extremely variable and unusual LREE patterns. The high Cr2O3 contents of these diamond inclusions are exceptional, and indicate a possible genesis intermediate between that of harzburgitic and lherzolitic garnets. Both the major- and trace-element compositions of the garnet inclusions within a single diamond are unique, illustrating that each diamond has experienced a distinctly different chemical environment during its formation, in some cases even varying significantly during different episodes of growth within one diamond. Results of this study emphasize that such diamonds have been subjected to extreme changes in P-T-X conditions during their complex growth histories.